I think in the majority of old types the first thing you will know about a rad alt failure is the EGPWS going to the wind. Then when you manage to find out where they have fitted the sodding thing on this airframe it will have a red flag on it.
But a word of caution the ATPL's use the 737 as it's generic Jet.
Be a bit careful using Airbus as a reference to answer questions.
On my type the answers would be
D A A